Tool
Shibuya [Beta] Reroll Planner
Pick a band from the reset panel, say how sure you want to be, and the planner returns the roll count, the cheapest pack mix and where the Legendary guarantee takes over.
Reroll planner
643 rolls ≈ R$58,097
Mythic clan at 0.25% odds, 80% confidence. No guarantee covers this band.
- 12 × 50-pack — R$54,000 (600 rolls)
- 2 × 20-pack — R$3,800 (40 rolls)
- 3 × single roll — R$297 (3 rolls)
Per-roll price here is R$90.35. Packs priced 9 Nov 2026.
How to read the inputs
The band and its percentage sit in the left column of the reset panel, above the Roll button. The guarantee counter is the line under the reroll buttons. It only names Legendary, so it does nothing for a Mythic target.
Method and limits
Rolls needed is the geometric formula n = ceil(ln(1 − p) / ln(1 − q)) with q as the panel odds and p as your confidence. The pack mix is solved exactly against the prices below, not by a greedy guess. Two things are unconfirmed: whether each roll is truly independent, and whether the guarantee counter is shared between systems. Treat the answer as a budget, not a promise.
- 50-pack: R$4,500 (R$90.00 per roll)
- 20-pack: R$1,900 (R$95.00 per roll)
- 10-pack: R$990 (R$99.00 per roll)
- 5-pack: R$495 (R$99.00 per roll)
- Single roll: R$99 (R$99.00 per roll)
Inputs and outputs
Inputs: Rarity band, Confidence target, Robux budget, Legendary guarantee counter. Outputs: Rolls needed, Robux cost, Cheapest pack mix, Guarantee position.
What to do with the result
If the guarantee counter is closer than the odds require, roll for the guarantee instead of chasing a rarer band. If the total is far past what you meant to spend, claim the free rolls on the codes page first.